Minelab GPX-4500 User manual
- Category
- Measuring, testing & control
- Type
- User manual
Instruction Manual
Quick Start
Set the front panel switches to the following positions:
Threshold
Auto Tune
Ground
Balance
Tracking
Fixed
Threshold
On/Off
Hold for FP
Push and release the On/Off switch on the rear
control panel (pg. 25).
Turn the Threshold (pg. 34) control clockwise until a hum
is audible through the headphones.
Raise the coil off the ground and Press the Auto Tune
(pg. 33) button to reduce electrical interference. The
tuning process takes approximately 60 seconds. Do not
move the coil or pass metal objects near the coil during
the tuning process.
Whilst lowering and raising the coil between 25mm and
100mm (1" and 4") from the ground, change the Ground
Balance switch to Tracking (pg. 40). Any variations in the
Threshold will smooth out within 3–5 seconds.
Adjust the Threshold (pg. 34) to a very faint but still
audible level. It should be smooth with only minor
fluctuations.
You are now ready to start searching!
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Item Number: 4901 - 0063
Revision: 1.1
THIS DEVICE COMPLIES WITH
PART 15 OF THE FCC RULES
Operation is subject to the following two
conditions: (1) this device may not cause
harmful interference, and (2) this device
must accept any interference received,
including interference that may cause
undesired operation.
Disclaimer:
The Minelab metal detector discussed
in this operating manual has been
expressly designed and manufactured as
a quality hobbyist metal detector and is
recommended for use in coin, treasure and
general metal detection in non-hazardous
environments. This metal detector has not
been designed for use as a mine detector
or as a live munitions detection tool.
Working for a Cleaner,
Greener Future
For Consumers within the European
Union: Do not dispose of this equipment
in general household waste.
The crossed wheeled bin symbol on this
equipment indicates this unit should
not be disposed of in general household
waste, but recycled in compliance
with local government regulations and
environmental requirements.
Please dispose of this equipment via a
recycling service or centre, or by returning
the unit to the respective Minelab outlet
as appropriate for your unit. This will enable
the equipment to be disposed of in an
environmentally safe manner.
Disposal of unwanted electronic
equipment in land filled waste may
contribute to adverse long term
environmental effect due to the
leaching of contaminating and toxic
substances contained within some
electronic equipment.
©
Minelab Electronics Pty Ltd
This document contains proprietary
information which is protected by
copyright. Apart from any use as
permitted under the Copyright Act
1968, no part may be reproduced by
any process without written permission
from Minelab Electronics Pty Ltd, 118
Hayward Avenue, Torrensville, SA 5031,
Australia.
WARNING. This document contains
Minelab Electronics Pty Ltd rights,
technical data or restricted rights data,
or both. Patents and trademarks apply.
The World Leader in Metal Sensing Technology
From our origins in 1985, Minelab have specialised in advanced electronic
technologies. Our competitive advantage was created almost immediately with a
highly competent and innovative Research and Development team, inspired by the
genius of Mr Bruce Candy.
This commitment to innovation has enabled us to successfully market feature
packed Consumer coin and treasure detectors enjoyed by hobbyists worldwide
as well as high quality gold detectors used by both professionals and amateurs.
Minelab’s advanced technology is also incorporated in detection equipment
designed for military and humanitarian de-mining projects throughout the world.
Today Minelab has manufacturing, distribution and customer service operations
in Australia, Europe and the United States, and is an ISO 9001 Quality Endorsed
Company. ISO 9001 is a worldwide quality standard certification that ensures the
highest level of product quality for our customers.
Please note:
Since there may be a variety of options
available for this detector, equipment
may vary according to the Model or
items ordered with your detector. Certain
descriptions and illustrations may also
differ (in this manual) from the exact Model
that you purchased. In addition, Minelab
reserves the right to respond to ongoing
technical progress by introducing changes
in design, equipment and technical
features at any time.
Minelab Electronics Pty Ltd
PO Box 537, Torrensville Plaza
Adelaide, South Australia, 5031
Australia
Tel: +61 (0) 8 8238 0888
Fax: +61 (0) 8 8238 0890
Email: [email protected]
Minelab International Ltd
Laragh, Bandon
Co. Cork
Ireland
Tel: +353 (0) 23 52101
Fax: +353 (0) 23 52106
Email: [email protected]
Minelab USA Inc
871 Grier Drive, Suite B1
Las Vegas, Nevada, 89119
USA
Tel: +1 702 891 8809
Fax: +1 702 891 8810
Email: [email protected]
For further product information
and detecting tips, refer to:
WWW.MINELAB.COM
Minelab is always interested in your opinions. If you have
any questions or comments regarding the GPX-4500 or any
other Minelab product, please feel free to contact us via
your local Authorised Minelab dealer, or write to us:
1
Gold detecting is a fascinating and rewarding
activity enjoyed by people all over the world. By
getting to know your GPX-4500 you can become one
of the many who find gold and valuable treasure.
The GPX-4500 is Minelab's most advanced
gold detector. It is a high precision instrument
incorporating Multi-Period Sensing (MPS), Dual
Voltage Technology (DVT), Smart Electronic Timing
Alignment (SETA), and the latest in high-tech
analogue components combined with advanced
digital processing.
The GPX-4500 will locate gold in all types of ground,
especially highly mineralised ground conditions,
with greater efficiency than any previous detector.
This manual is designed to help both the beginner
and expert prospector get the best performance out
of the GPX-4500.
Minelab wishes you every success in your quest
for gold and treasure!
Congratulations on
Purchasing the Minelab
GPX-4500
2
3
Contents
Quick Start Back Cover
Introducing the GPX-4500 4
List of Parts 6
Assembly 8
Adjusting the Detector for Comfortable Detecting 16
Charging the Battery 18
Battery LED Patterns 20
Taking Care of Your Battery 21
Detecting Basics 22
Detector Sounds 23
Front Control Panel 24
Rear Control Panel 25
Turning the Detector On 26
LCD Menu Structure 27
Search Mode 28
Tune / Reducing Electrical Interference 32
Auto Tune 33
Threshold / Adjusting the Background Audio Level 34
Soil/Timings / Optimising for Soil & Target Types 36
Ground Balance / Reducing Ground Noise 38
Ground Balance Procedure for Tracking 40
Ground Balance Procedure for Fixed 42
Coil/Rx / Changing Transmit and Receive (Rx) Fields 44
Resetting Factory Presets 46
Factory Presets 48
Function Select 50
Setting 51
Accessing Functions 52
Accessing Settings 53
LCD Backlight 54
Battery / Viewing the Battery Voltage 55
Volume Limit / Setting the Max Volume of all Sounds 56
Ground Balance Type 58
Ground Balance Procedure for Specific 60
Special / Soil/Timings 61
Manual Tune / Reducing Electrical Interference 63
Changing Search Modes 64
Motion / Adjusting Sweep Speed 66
Rx Gain / Adjusting the Sensitivity of the Detector 67
Audio Type / Changing the Response of Target Signals 68
Audio Tone / Adjusting the Pitch of the Threshold 69
Stabilizer / Controlling the Stability of the Threshold 70
Signal Peak / Adjusting Pitch Variation of Target Signals 72
Target Volume 73
Response / Inverting the Pitch of the Target Signal 74
Tracking Speed / Keeping up with Changing Ground 76
Iron Reject 78
Iron Reject / Rejecting Ferrous Targets 80
Custom Name 82
Pinpointing / Locating the Target 84
Recovering the Target 86
Detecting Tips 88
Commander Coils 90
Choosing the Right Coil for the Job 92
Troubleshooting 94
Glossary of Terms 95
Taking Care of Your Detector 98
Technical Specifications 99
User Preferences 100
User Notes 102
Warranty 103
Service Repair Form 104
Function
Select
Setting
On/Off
Hold for FP
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Item Number: 4901 - 0063
Revision: 1.1
4
5
Introducing
the GPX-4500
Rx Gain
The Rx Gain function sets the overall
sensitivity level of your detector. In
areas where soil conditions are mild
you can increase the Rx Gain. In areas
that are more difficult Rx Gain can
be reduced.
Timings
The GPX-4500 features a number of
new timings, increasing performance in
different conditions.
Ground Balance (GB) Type
Ground Balance Type now has three
settings: Normal, Specific, and GB Off.
Normal is the preferred setting for most
soil types. Specific Ground Balance
is designed to be used in very hot
ground, and is especially useful with
Monoloop coils. GB Off switches the
ground balance circuit off for maximum
depth in very mild soils, sand etc.
Response
The Response function allows you
to invert the target response. Deep
targets can now sound like the more
familiar 'rising and falling' pitch of a
shallow target signal.
The GPX-4500 utilises Minelab’s proven 'Dual Voltage
Technology' (DVT). This ensures an accurate Ground
Balance to provide maximum sensitivity and depth
in all ground types.
The GPX-4500 offers a total of six Timing options,
each incorporating the all-new SETA technology.
Smart Electronic Timing Alignment (SETA) ensures
the detector is precisely aligned for each individual
Timing option. This improvement in calibration
reduces the susceptibility to certain types of
interference, and significantly improves
the detector’s immunity to highly magnetic
rocks and soils.
Through a process of dynamic noise compensation,
SETA ensures that the threshold stability is improved
and maintained, allowing you to operate the GPX-
4500 with maximum efficiency under all conditions.
The GPX-4500 now offers six preprogrammed
Search Modes, set up for the most common
search techniques.
All modes can be fine tuned by simply scrolling
through the various functions of the detector and
adjusting the settings.
With improved fuctionality and new timings the
GPX-4500 is capable of finding nuggets in a diverse
range of ground conditions with greater ease than
previous detectors.
Motion
The speed at which you sweep the
coil has an effect on target response
time and Ground Balance adjustment.
Matching your preferred coil sweep
speed with the corresponding Motion
setting can reduce noise and improve
your ability to pick up targets at depth.
Custom Search Mode
With Custom selected, a range of new
custom search mode positions become
available from the LCD menu. A new
mode name picker is also included.
Create your own modes for different
locations and use them for future visits.
Stabilizer
This is a new feature which allows you
to fine tune your audio, to obtain the
best compromise between smooth
operation and clear target signals.
Target Volume
Used to control the built-in amplifier
which affects the volume of target
signals. It is active with both
headphones and an external speaker.
Target Volume can also be used to
reduce the severity of ground signals.
Functions
Overview
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List of Parts
8
9
Attaching the Coil to the Lower Shaft:
1 Plug the two rubber washers into the holes on
either side of the lower shaft.
2 Ensure that the spring loaded pin of the lower
shaft is pointing downwards. Slide the lower shaft
into the bracket on top of the coil.
3 Insert the bolt through the lower shaft and the
bracket on top of the coil. Fasten with the nut
provided; being careful not to damage the thread
of the nut by over-tightening. This may need to
be loosened to adjust the coil to a comfortable
detecting angle.
Note: If the coil becomes loose over time the rubber
washers may need replacing.
Assembly
Attaching the Lower Shaft to the Upper Shaft:
1 Rotate the twistlock of the upper shaft counter-
clockwise to ensure it is loosened.
2 Compress the spring loaded pin of the lower shaft.
Slide the lower shaft into the upper shaft until the pin
reaches an adjustment hole. The pin will spring out
and clip into place.
3 Rotate the twistlock clockwise to clamp the lower
shaft and prevent movement.
Attaching the Handle to the Upper Shaft:
1 Slide the bungy cord clamp onto the upper shaft.
2 Slide the handle onto the upper shaft so it slopes
away from you, as seen below.
Attaching the Armrest to the Upper Shaft:
1 Place the two armrest halves on either side of
the upper shaft, aligning the armrest and upper
shaft holes.
2 Insert the bolts through the armrest and upper
shaft holes.
3 Loosely fasten the wing-nuts onto the bolts (these
will be tightened after the control box is attached).
spring loaded pin
The Coil cable is directly wired into the coil and
is not removable. Any attempt to disconnect
this cable will void your warranty
10
11
Assembly
Connecting the Coil Cable:
1 Wind the coil cable around the lower and upper
shafts enough times to take up the slack. Leave
enough slack at the bottom of the cable near the
coil to allow the angle of the coil to be adjusted
while detecting.
2 Use the velcro straps to secure the coil cable to
the shaft.
3 Plug the coil connector into the coil socket on the
control box, firmly tightening the retaining ring to
hold it in place.
Attaching the Armrest Strap to the Armrest:
1 Press both strap studs onto the armrest studs.
2 Push the armrest straps through the slots in
the armrest cover and then slide the cover
over the armrest.
Connecting the Control Box to the Upper Shaft:
1 Place the detector on a flat surface, with the
handle facing upwards.
2 Position the armrest on top of the control box.
3 Clip the control box onto the armrest, ensuring
the battery plug faces away from the coil.
4 Fasten with the wing-nuts.
5 Wind the Quick-Trak button cable around the
upper shaft and plug it into the Smart Point
socket in the control box. Ensure that the cable is
wrapped firmly but avoid strain on the connector.
Always ensure that the control box is turned
off before connecting or disconnecting the coil
to avoid damage to the detector's electronics.
Note: If the Quick-Trak
cable becomes loose try
securing it onto the shaft
with electrical tape.
12
13
Connecting the Battery Pack:
1 Place the battery into the battery harness pouch.
2 Connect the headphones and the power cable to
the appropriate sockets in the battery.
Assembly
Note: The illustration shows
the battery orientated for
a user holding the detector
with their left hand.
Making use of the GPX-4500 Amplifier:
In previous Minelab detectors if a speaker was used,
instead of headphones, the audio level would be
significantly reduced. Now, the new Minelab Lithium
Ion battery contains an additional amplifier which
automatically increases the audio level when a
correctly wired speaker is used.
The new Minelab Lithium Ion battery will
automatically detect if headphones or a speaker is in
use and adjust the audio level accordingly.
See wiring diagram below for correct speaker to
audio jack wiring.
Note: After market
accessory boosters may
not operate in conjunction
with this built in amplifier.
However, the detectors
'Target Volume' adjustment
allows you to adjust the
target signal volume and
threshold, so accessory
boosters are unlikely to
be needed.
Caution: Never re-wire your headphones so that
they are similar to the external speaker as the
audio level may damage your hearing.
External Speaker
TipRing
Caution: The battery should initially be charged
for 8 hours before use.
Not connected
14
15
Assembly
Fitting the Battery Harness:
1 Thread your arms through the harness,
so the battery pack sits on your back.
2 Clip the waist and chest buckles together.
For more detail see Adjusting the Detector
for Comfortable Detecting (pg. 16).
Attaching the Bungy Cord:
1 Create a loop in the bungy cord.
2 Undo the plastic wingnut and remove the
bolt from the clamp.
3 Push the bolt back through the clamp and
loop to secure the bungy cord to the shaft.
4 Fasten the screw with the wingnut.
5 Clip the bungy cord onto one of the harness
shoulder strap rings.
For more detail see Adjusting the Detector
for Comfortable Detecting (pg. 16).
16
17
Note: For comfortable,
long term detecting, it is
important you take the
time to adjust the
detector correctly.
Adjusting the Detector
for Comfortable Detecting
Adjusting the Battery Harness:
A comfortable fitting battery harness will ensure the
longest detecting session possible without fatigue.
Ideally the battery should be placed on your back so
that it counter-balances the weight of the detector.
You should be able to reach the switches of the
detector without putting excess strain on the
bungy cord.
Pull the straps outwards and downwards to tighten.
Push the straps back through the buckle to loosen.
The harness may also be adjusted around your body
by threading the front straps through different loops
on the waistbelt.
Adjusting the Bungy Cord Clamp
(Bow Knuckle):
The correct position of the bungy cord clamp (bow
knuckle) along the shaft can help take the weight of
the coil.
Loosen the clamp screw so it can slide along
the shaft. Slide it to a position that feels most
comfortable for you.
Note: You may need to change the length of the bungy
cord, or the position of the bungy cord clamp, when
you change coils or detect on sloping ground.
Holding the Detector:
Thread your arm through the armrest and strap.
Grasp the handle of the detector and rest your
forearm in the armrest.
Adjusting the Position of the Handle:
Your elbow should sit just above the back of the
armrest allowing you to comfortably grip the handle.
Slide the handle into position. Using a screwdriver,
tighten the two screws which hold the handle
onto the shaft. Adjust the handle strap to a
comfortable position.
Adjusting the Length of the Lower Shaft:
If the coil is too far from your body it will be difficult
to balance and manoeuvre while detecting.
If the coil is too close to your body it may detect your
pick, the battery, or any other metal which you are
carrying; causing confusing sounds.
Rotate the twistlocks of the shafts counter-clockwise
to ensure that they are loosened.
Compress the spring pins of the shafts and move
them up or down to suit. Once all shafts are clipped
into position, rotate twistlocks clockwise onto the
shafts until they are firmly clamped.
The correct length of the lower shaft should allow
you to swing the coil in front of your body without
any uncomfortable stretching or stooping.
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Tip: Some operators may
find it more comfortable
to fit the battery around
the waist. However, make
sure the GPX-4500 isn't
detecting a signal from the
battery. If using a large coil,
position the battery as high
up on your back as practical
(and comfortable) to avoid
any unwanted interference.
18
19
The aluminium battery case contains the 7.4V
Lithium Ion (Li-Ion) battery pack and an internal
charging circuit. Supplied with the GPX-4500 is
a mains charger adaptor and a 12V vehicle
charger adaptor.
When fully charged, the battery will provide
enough power to operate the detector for
approximately 12 hours.
The charger will recharge a flat battery in
approximately 5 hours, but partially discharged
batteries require a shorter recharge time. There is
no need to fully discharge the Li-Ion battery before
recharging, it can be recharged at any time you are
not detecting.
Note: Some after market coils can drain the battery at
a higher rate which may reduce your operating time
by up to 30%.
Mains Charger Adaptor
The mains charger adaptor will charge the battery
from local mains (AC) power outlets.
To Charge with the Mains Charger Adaptor:
1 Disconnect the power cable from the battery.
2 Connect the mains charger adaptor to the
battery power plug and the wall socket.
3 Switch the wall socket on.
Vehicle Charger Adaptor
The vehicle charger adaptor will charge the
battery from the accessories socket (cigarette
lighter) of most motor vehicles. The socket must
be 12–24VDC.
To Charge with the Vehicle Charger Adaptor:
1 Disconnect the power cable from the battery.
2 Connect the vehicle charger adaptor to the
battery and to the vehicle accessories socket.
The colour scheme of the tri-colour LED (pg. 20)
will indicate the status of the charging process.
Note: Don't leave the battery on charge in a closed
vehicle on a hot day as it is temperature protected
and will stop charging.
Charging the Battery
Tip: A spare battery is
available as an accessory. If
travelling into remote areas
a spare battery will ensure
you can continue detecting
for long periods of time.
To prevent damage to the battery, do not
start the vehicle's engine while the battery
is connected.
Make sure your vehicle's battery is in good
condition before using it to charge the
GPX-4500 battery.
The colour scheme of the tri-colour LED (pg. 20) will
indicate the status of the charging process.
Caution: The battery should initially be charged
for 8 hours before use.
20
21
The Lithium Ion battery is specifically designed
for the GPX-4500.
The Lithium Ion battery is not compatible with
non GPX detectors. The GPX-4500 is supplied with a
power lead which has been specifically designed to fit
GPX detectors only. Attempting to use the Lithium Ion battery
pack with other detectors may damage the detector or the battery pack.
Do not try to adapt this battery to other models as it will very likely
cause damage.
• Do not charge the battery at temperatures above 45°C (113°F).
• Do not charge the battery at temperatures below 0°C (32°F).
• Do not leave the battery in hot conditions (e.g. on the dashboard
of your car or rear parcel shelf).
• Do not immerse the battery in any liquid or allow water ingress.
• Do not throw the battery or impact it in any way.
• Do not short-circuit the battery.
• Do not use the battery if it is damaged or deformed.
• Do not disassemble or reconstruct the battery.
• Do not incinerate the battery.
In the event of a fault, you should return the battery to a Minelab
authorised service centre for repair.
The use of non-approved components will VOID YOUR WARRANTY.
There are no user serviceable parts within this battery pack.
Battery LED Patterns
Brief cycling red-orange-green: Occurs when the charger is turned on or when
a new battery is connected
Solid orange: First phase of charge
Orange with green blink: Last phase of charge
Solid green: Battery is charged
Slow red blinking: The battery is too hot. It has reached a
temperature over 50°C (122°F) and will not
charge. Disconnect the battery and wait for
it to cool below 40°C (104°F) in a cool place
before reconnecting.
Continuous orange blinking: The first phase of charging has timed out. If
this continues to occur each time the battery
is charged the battery is no longer functioning
correctly. Contact your dealer.
Solid red: There is a fault with the battery.
Disconnect and reconnect the battery.
If the LED is still red contact your dealer.
Routine
Exceptions
Taking Care
of Your Battery
22
23
Detector Sounds
Target Response
(Metal Object Response)
This is a change in the tone (pitch)
and volume of the Threshold
when a target is detected and not
discriminated (rejected).
Threshold (Background sound)
This is the background sound produced
by the detector. When a target is
detected, the Threshold (pg. 34)
changes in volume and pitch. Listen to
the Threshold carefully. Concentration
is an important part of detecting.
A very deep or small target may only
cause a very small change to
the Threshold.
Electrical Interference
The detector may produce random
sounds when the coil is motionless.
These will not be target signals, but
signals caused from the surrounding
environment. The GPX-4500 has a Tune
(pg. 32) function to overcome electrical
interference.
Note: The GPX-4500 is a
‘motion’ detector. This
means it must be moving
over a target to detect it.
Detecting Basics
The GPX-4500 will perform at its best when the coil
is kept close and parallel to the ground at all times.
This will increase the detection depth and target
response to small objects.
A variation in coil height at the end of each swing
may cause confusing sounds and reduce detection
depth; an even flat sweep is desirable.
Practise sweeping the coil over the ground in a
side-to-side motion, while walking forward slowly at
the end of each sweep. Slightly overlap the previous
sweep to ensure full ground coverage. An average
sweep speed is four seconds from left to right to left.
Ground Noise
Certain minerals may cause the
detector to produce various sounds;
often referred to as false signals. The
GPX-4500 has an automatic Ground
Balance function (pg. 38) to overcome
ground noise.
Blanking
When the detector is in Iron Reject
mode and sweeping over a ferrous
target the Threshold ‘blanks’ (becomes
silent), indicating that a target is
located underneath the coil but has
been rejected. Blanking (pg. 79) is a
useful way of distinguishing between
desired and undesired targets.
Low Battery
When the battery voltage (pg. 55) is
low, a series of alarm signal pulses are
given at one minute intervals.
Tip: When using a Monoloop coil more overlap is
required to ensure that targets at maximum depth are
not overlooked (see pg. 90 for a diagram showing coil
search patterns).
24
25
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Search Mode
(pg. 28) Each Mode
has factory preset
settings to suit that
style of searching.
Search Modes can
also be customised
to suit different
detecting conditions.
Soil/Timings
(pg. 36) allows
you to change the
electronic pulses/
timings of the
detector to optimise
performance for
different soils and
target types.
Ground Balance
(pg. 38) reduces
the ground
noise caused by
mineralisation.
Coil/Rx (pg. 44)
allows you to
change the
transmit and
receive (Rx) fields
of the coil.
Auto Tune (pg. 33) automatically scans
a range of frequency channels to help
reduce electrical interference.
Coil Connector
Connects the coil to the control box.
Smart Point is a connection point
for the Quick-Trak button located on
the handle.
Threshold (pg. 34) is the background
sound produced by the detector. This
control increases / decreases the level
of the Threshold.
Front Control Panel Rear Control Panel
Function
Select
Setting
On/Off
Hold for FP
Setting (pg. 51)
Once a function
has been selected,
Setting allows you to
adjust its value.
Function Select
(pg. 50) scrolls up or
down through the list
of functions.
LCD
(Liquid Crystal Display)
Displays all the menu
functions and settings.
Now with backlight
(pg. 54).
Battery Connector
connects the control
box to the battery
and headphones.
On / Off (pg. 26)
turns the detector
on and allows you
to restore Factory
Presets.
26
27
Turning the Detector On
Function
Select
Setting
On/Off
Hold for FP
It is best to only turn the detector on
when outdoors and away from sources
of electromagnetic disturbance such
as power lines, transmitters, electric
fences and phone towers. These
sources may cause the detector to
perform erratically, giving numerous
false signals.
Note: If the detector emits an overload
sound move the coil away from any
large metal objects. Overloading is
not harmful to the electronics of
the detector.
The On / Off switch is located
on the rear control panel.
To turn the detector on or off:
Press and release the On / Off toggle switch.
Many of the GPX-4500
functions are accessed
through the LCD Menu.
These are explained in
further detail throughout
the rest of this manual.
Until you become more
familiar with the GPX-
4500, the detector can
simply be operated with
the Factory Presets
(pg. 48) and the front
panel controls.
Functions Settings
LCD Menu Structure
Avoid turning the detector on and off repeatedly.
If this happens the Coil Overcurrent screen will
appear. Turn the detector off and wait for a short
time before turning the detector on again.
28
29
Search Mode
The GPX-4500 has three Search Mode switch
positions: General, Deep and Custom.
Each Search Mode switch position has a series of
Factory Preset settings saved so that you can start
detecting right away. After you are familiar with the
GPX-4500 these can be customised with personal
preferences to suit different detecting conditions.
The General and Deep modes have their own switch
position. Custom Mode position is for one of the
four additional search modes (pg. 64), which you can
select through the LCD menu.
General (G)
The General Mode will provide the best compromise
of sensitivity, stability, depth and signal response
under a variety of conditions. For this reason it is
likely that General will be your primary search mode,
reserving the others for a specific task or scenario.
Deep
The Deep Mode should be used when you are
detecting a small area very slowly and carefully; such
as when chaining or cross-gridding a run of nuggets
on a slope. Deep Mode is optimised for a very slow
sweep to provide maximum depth, on large targets.
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Custom
The Custom Search Mode provides a choice of four
additional search modes (pg. 64) which can be
selected from the LCD menu.
These are: – Patch (Factory Preset Selection)
– Hi-Mineral
– Hi-Trash
– Test A
This allows a total of six separate search modes
which can be set up for different circumstances.
The Main Menu
functions are the
same for each
Search Mode.
The functions for
each of the six
Search Modes
can be saved with
different settings.
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
Auto Tune
Search
Mode
Soil /
Timings
Ground
Balance
Coil /
Rx
CancelTrackingSpecialDeep
Custom Enhance Fixed Double D
MNG
Threshold
Coil
Smart
Point
30
31
Search Mode
(Continued)
Selecting Custom Mode
When the Search Mode switch is in the Custom
position each of the four Custom Search Modes
(pg. 64) are available, and can be selected from the
LCD menu.
The four Custom Search Modes are:
Custom Search Mode - Patch
The Patch mode is set up for prospecting unknown
ground when you are likely to be walking and
detecting faster, seeking a first nugget that may
indicate a new area worthy of further investigation.
Custom Search Mode - Hi Mineral
This mode will help to stabilise the detector in highly
mineralised soils, yet still remain sensitive to small
and deep targets. You may need to adjust the Rx
Gain setting to suit your particular location.
Custom Search Mode - Hi Trash
This mode has factory presets specifically selected
for detecting in an area containing a lot of rubbish.
The Iron Reject (pg. 78-81) setting has been factory
set quite high so you may want to reduce this if you
want to be more cautious.
Custom Search Mode - Test A
This is a default mode initially set with the same
settings as General, which you can use to experiment
with and compare with other modes.
All four of these Custom Search Modes can be
renamed (pg. 82).
32
33
Note: Tuning should be
done initially with the
Coil switch in Double-D
or in Monoloop (M). If the
interference is still severe
after completing the tuning
operation change the Coil
switch to Cancel and then
re-tune the detector if
necessary.
Tune
Reducing Electrical Interference
To Perform an Automatic Tune:
1 Hold the detector at waist height, with the coil
vertical, and slowly rotate through a half-circle.
Make sure there are no large targets or obvious
electrical interference sources close by.
2 Face the direction of the most interference and
hold the coil steady.
If you have difficulty holding the detector very still
for 60 seconds, you can place the detector on the
ground with the coil vertical.
3 Press the Auto Tune button. Keep the detector
completely still during the automatic channel
scanning process.
A single beep indicates the beginning of the Auto
Tune. The detector will begin to scan each channel
for the least interference. This may take up to
60 seconds.
The detector will select the quietest operating
channel identified. The end of the Tuning process
will be indicated by three sharp ‘beeps’.
When tuning the detector in close proximity to other
detectors, each operator needs to take turns tuning.
Do not try to tune two detectors at the same time.
Any interference is made more obvious with a faster
Motion setting (pg. 66). Therefore, you can assist
the Auto Tune function in selecting the quietest
frequency band by selecting Fast Motion before
performing the Auto Tune process. When the process
is complete simply return the Motion speed to its
original setting.
The detector may be affected by electrical
interference from powerlines, radio transmitters
electrical equipment or other detectors operating
close by. This interference causes the Threshold to
become erratic.
So that the detector experiences the least
interference for the current environment the search
channel can be changed automatically by the Auto
Tune button on the control panel, or manually in the
Manual Tune (pg. 63) setting via the LCD menu.
Auto Tune instructs the detector to automatically
listen to every channel and select the quietest
position. Automatic tuning may take up to 60
seconds.
The Manual Tune setting, via the LCD menu, allows
you to manually select and listen to every channel
for the least interference.
The best channel to select will be the one where the
audio response to electromagnetic disturbances
(e.g. powerlines) is the lowest.
It is best to tune with the coil away from the
ground and as stationary as possible. This gives the
detector the best chance of sensing all surrounding
interference (not associated with the ground or
targets) too select the quietest channel.
Note: Interference in some locations can change
during the course of the day so you may need to re-
tune from time to time to maintain a stable Threshold
as you move around the area.
There is only one Tune setting. Any changes made
manually will override the Auto selection.
Auto Tune
Auto Tune
Tip: If you would like to
know what channel has
been chosen after an
automatic Tune, access
the Manual Tune screen
and check the number
displayed.
500mm (20")
34
35
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Threshold
Adjusting the Background
Audio Level
Threshold is the constant audible background tone
or 'hum' produced by the detector. The Threshold
is your reference point and lets you know what the
coil is picking up, whether it may be a target, ground
noise, or electrical interference, so it is important to
set the threshold so it can be heard.
The level of the Threshold should be set low, but still
audible and stable. Ideally it should be a smooth,
gentle hum. If you set it so that it can't be heard you
may set other detector settings incorrectly.
Small targets or large deep targets may not produce
a distinct target signal, but may cause only a small
variation in the Threshold. If the Threshold level is
set too high or too low these very small variations
may be missed.
Listening for a target signal with a high Threshold
would be like trying to hear a whisper within a
crowded noisy room. A high Threshold may also be
uncomfortable to your hearing.
If the Threshold is set too low the target signal needs
to be loud enough to become audible. Therefore,
very soft target signals, from small or very deep
targets, may not be heard.
It is important to reset the Threshold level as
conditions change. For example, your ears may
adjust to the low levels of audio after an hour or so,
or the conditions may have become windy.
Threshold
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When the Threshold
is too high a faint signal
is masked and only the
peak of the loud signal
is audible above
the Threshold.
With the Threshold set
correctly both target
signals are easily heard.
A Threshold level that
is too low does not allow
faint target signals to
be heard.
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Minelab GPX-4500 User manual
- Category
- Measuring, testing & control
- Type
- User manual
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